... under-voltage, over-voltage,over-flow, overload, waterless , automatic recovery ,controlling water height as demand.2.Easy installation, ... 25% than traditional AC pump. 4. Material: 1)stainless steel casing, shaft core, coupling and pump body, copper ... high-strength and wear-resistant. 2) Water immersion style stainless steel submersible motor, graphite bearings .Application: Water irrigation, high ...